Once CO2 supply is stopped, aquarium water often flows backward into the silicon tube toward the regulator. If water enters regulator, it may cause serious damage. In order to avoid accidents, be sure to use a no-return valve. A standard plastic no-return valve, loses its function due to wear and tear of its internal bladder, however the all glass, handmade Cabochon Ruby can be used indefinitely, and makes an elegant addition to your aquarium.
Always use in an upright position
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